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Search for top squarks decaying to tau sleptons in $pp$ collisions at $\sqrt s$ = 13 TeV with the ATLAS detectorhttps://cds.cern.ch/record/2297260
A search for direct pair production of top squarks in final states with two tau leptons, $b$-jets, and missing transverse momentum is presented, based on 36.1 fb$^{-1}$ of proton$-$proton collision data recorded at $\sqrt{s}$ = 13 TeV with the ATLAS detector at the Large Hadron Collider in 2015 and 2016. Two exclusive channels with either two hadronically decaying tau leptons or one hadronically and one leptonically decaying tau lepton are considered. No significant deviation from the Standard Model predictions is observed in the data. The analysis results are both interpreted in terms of model-independent limits and used to derive exclusion limits on the masses of the top squark $\tilde t_1$ and the tau slepton $\tilde\tau_1$ in a simplified model with a nearly-massless gravitino. In this model, masses up to $m(\tilde t_1)=$ 1.16 TeV and $m(\tilde\tau_1)$ = 1.00 TeV are excluded at 95$\,$% confidence level.The ATLAS collaborationWed, 13 Dec 2017 23:19:16 GMT14 Dec 2017ATLAS-CONF-2017-079https://cds.cern.ch/record/22972602017079The CMS Collaboration - a photographic journey https://cds.cern.ch/record/2297246
Booklet to celebrate 25 years of the CMS CollaborationPetrilli, AchilleLapka, MarzenaRao, AchintyaWed, 13 Dec 2017 17:08:11 GMT2017-12-13CMS-OUTREACH-2017-013https://cds.cern.ch/record/22972462017013Caractérisation de détecteurs à plaques résistives de verres de basse résistivité en vue de la mise à niveau de CMShttps://cds.cern.ch/record/2297193
Lagarde, FrancoisGrenier, GéraldGouzevitch, MaximeWed, 13 Dec 2017 10:25:28 GMTCERN-THESIS-2017-262https://cds.cern.ch/record/22971932017262Search for supersymmetry in events with tau leptons and
missing transverse momentum in proton-proton collisions at sqrt(s)=13 TeVhttps://cds.cern.ch/record/2297162
A search for supersymmetry is performed using events with $\tau$ leptons in the final state with 13 TeV data recorded in 2016, corresponding to an integrated luminosity of $35.9~\mathrm{fb}^{-1}$. Models of direct $\widetilde{\tau}$-pair production, where each $\widetilde{\tau}$ is expected to decay to a $\tau$ lepton and the lightest supersymmetric particle, the $\widetilde{\chi}^{0}_1$, as well as neutralino-chargino and chargino pair production with decays to $\tau$ leptons are investigated. Several exclusive search regions are defined to maximize the sensitivity to various new physics topologies, based on final states with one hadronically decaying $\tau$ lepton and an electron or muon from the decay of the second $\tau$, as well as final states with one electron and one muon from the decay of the $\tau$ leptons.
The data are consistent with the standard model expectation, and $95\%$ CL limits are set for several scenarios. For neutralino-chargino production with mass-degenerate chargino ($\widetilde{\chi}^{\pm}_1$) or neutralino ($\widetilde{\chi}^{0}_2$), exclusion limits on the $\widetilde{\chi}^{\pm}_1$ and $\widetilde{\chi}^{0}_2$ masses can reach up to $560~\mathrm{GeV}$, depending on the masses of the intermediate $\widetilde{\tau}$ and the $\widetilde{\chi}^{0}_1$. The upper limit on cross section times the square of the branching fraction for direct $\widetilde{\tau}$-pair production is set to be $0.66~\mathrm{pb}$ for a $\widetilde{\tau}$ mass of $90~\mathrm{GeV}$ and a $\widetilde{\chi}^{0}_1$ mass of $1~\mathrm{GeV}$.CMS CollaborationWed, 13 Dec 2017 04:24:36 GMTCMS-PAS-SUS-17-002https://cds.cern.ch/record/229716217002Search for a heavy right-handed W boson and a heavy neutrino in events with two same-flavor leptons and two jets at sqrt(s)=13 TeVhttps://cds.cern.ch/record/2297161
A search for a heavy right-handed $\mathrm W$ gauge boson and a heavy right-handed neutrino at the CERN LHC has been conducted by the CMS collaboration in events with two same-flavor leptons ($\mathrm e$ or $\mu$) and two jets, using 2016 proton-proton collision data corresponding to an integrated luminosity of $\mathrm{35.9\,fb^{-1}}$. No excess above the standard model expectation is seen in the invariant mass distribution of the dilepton plus dijet system. Assuming identical couplings and decay branching fractions as the standard model $\mathrm W$ gauge boson, and that only one heavy neutrino flavor ${\mathrm N}_R$ contributes significantly to the ${\mathrm W}_R$ decay width, the region in the two-dimensional ($m_{{\mathrm W}_R}$, $m_{{\mathrm N}_R}$) mass plane excluded at a $95\%$ confidence level extends to approximately $m_{{\mathrm W}_R}= \mathrm{4.4\,TeV}$ and covers a large range of neutrino masses below the ${\mathrm W}_R$ boson mass. This analysis provides the most stringent limits to date.CMS CollaborationWed, 13 Dec 2017 04:24:23 GMTCMS-PAS-EXO-17-011https://cds.cern.ch/record/229716117011Studies of cosmic ray events in ATLAS sTGC muon chamber prototypeshttps://cds.cern.ch/record/2297158
Four years after its first long shutdown in 2015, the Large Hadron Collider (LHC) will be shut down once more for a luminosity upgrade. During that time, the ATLAS detector on the LHC ring will also follow an upgrade program, one upgrade being the replacement of the Small Muon Wheels for a New Small Wheel containing small-strip Thin Gap Chambers (sTGCs). The sTGCs built in Canada will be tested at McGill University before their installation in ATLAS. A testing facility has been constructed and a 40 × 60 cm^2 sTGC prototype has been used to deliver preliminary measurements from cosmic rays. This thesis will present the development of a robust tracking algorithm which can handle extra clusters and multiple tracks in an sTGC detector. This algorithm also categorizes events based on their number of clusters and tracks. By modifying the trigger time window of the sTGC prototype, the evolution of the distribution of events over this categorization is shown.Leger, FelixRobertson, StevenWarburton, AndreasWed, 13 Dec 2017 02:48:50 GMTCERN-THESIS-2017-261https://cds.cern.ch/record/22971582017261Modeling Radiation Damage Effects in 3D Pixel Digitization for the ATLAS Detectorhttps://cds.cern.ch/record/2297151
Silicon Pixel detectors are at the core of the current and planned upgrade of the ATLAS detector. As the detector in closest proximity to the interaction point, these detectors will be subjected to a significant amount of radiation over their lifetime: prior to the HL-LHC, the innermost layers will receive a fluence in excess of 10$^{15}$ n$_\mathrm{eq}$/cm$^2$ and the HL-LHC detector upgrades must cope with an order of magnitude higher fluence integrated over their lifetimes. This work presents the details of a new digitization model that includes radiation damage effects to the 3D Pixel sensors for the ATLAS detector.The ATLAS collaborationWallangen, VeronicaTue, 12 Dec 2017 21:38:00 GMT12 Dec 2017ATL-INDET-PROC-2017-005https://cds.cern.ch/record/22971512017005Search for selectrons and smuons at $\sqrt{s}=13$ TeVhttps://cds.cern.ch/record/2297116
A search for direct production of the supersymmetric partners of electrons and muons is presented in final states with two opposite-charge, same-flavor leptons (electrons and muons), little hadronic activity, and missing transverse momentum. The data sample corresponds to an integrated luminosity of $35.9~\text{fb}^{-1}$ of proton-proton collisions at $\sqrt{s}=13~\text{TeV}$ collected with the CMS detector at the LHC in 2016. The analysis uses the $M_\text{T2}$ variable which generalizes the transverse mass for systems with two invisible objects, and exhibits an endpoint for standard model backgrounds containing a W boson. The observed yields are consistent with the expectations from the standard model, and the results are interpreted in the context of simplified models of supersymmetry, resulting in observed (expected) limits at the $95\%$ confidence level on the left-handed slepton mass of up to 400 (450) GeV and on the right-handed slepton mass of up to 290 (330) GeV for massless LSP, improving the existing limits by approximately 150 (200) GeV.CMS CollaborationTue, 12 Dec 2017 15:59:20 GMTCMS-PAS-SUS-17-009https://cds.cern.ch/record/229711617009Search for physics beyond the standard model in events with Higgs bosons and missing transverse momentum in proton-proton collisions at $\sqrt{s}=13~\mathrm{TeV}$https://cds.cern.ch/record/2297115
A search for physics beyond the standard model in events with one or more high-momentum Higgs bosons H decaying to pairs of b quarks in association with missing transverse momentum is presented. The data, corresponding to an integrated luminosity of $35.9~\mathrm{fb}^{-1}$, were collected with the CMS detector at the LHC in proton-proton collisions at the center-of-mass energy $\sqrt{s}=13~\mathrm{TeV}$. The analysis utilizes a new b quark tagging technique based on jet substructure to identify jets from $H\rightarrow b\overline{b}$. Events are categorized by the multiplicity of H-tagged jets, jet mass, and the missing transverse momentum. No significant deviation from standard model expectations is observed. In the context of supersymmetry (SUSY), limits on the cross sections of pair-produced gluinos are set, assuming that gluinos decay to quark pairs, H (or Z), and the lightest SUSY particle LSP through an intermediate next-to-lightest SUSY particle NLSP. With large mass splitting between the NLSP and LSP, and $100\%$ NLSP branching fraction to H, the lower limit on the gluino mass is found to be 2010 GeV.CMS CollaborationTue, 12 Dec 2017 15:59:16 GMTCMS-PAS-SUS-17-006https://cds.cern.ch/record/229711517006ATLAS Christmas Party 2017https://cds.cern.ch/record/2297114
Photo collection from the ATLAS Christmas party at R1Jarvis-Ward, EmmaTue, 12 Dec 2017 15:57:35 GMT2017-12-06ATLAS-PHOTO-2017-038https://cds.cern.ch/record/22971142017038Search for lepton flavour violating decays of heavy resonances and quantum black holes to $\mathrm{e}\mu$ pairs in proton-proton collisions at $\sqrt{s}=13~\mathrm{TeV}$https://cds.cern.ch/record/2297091
A search is reported for heavy resonances decaying into $\mathrm{e}\mu$ final states using proton-proton collision data recorded by the CMS experiment at the CERN LHC at $\sqrt{s}=13~\mathrm{TeV}$, corresponding to an integrated luminosity of $35.9~\mathrm{fb}^{-1}$. The search focuses on resonance masses above $200$ GeV. With no evidence found for physics beyond the standard model in the mass spectrum of selected $\mathrm{e}\mu$ pairs, upper limits are set at the $95\%$ confidence level on the product of the cross section and branching fraction for signals in models that incorporate lepton-flavour violation in interactions of charged leptons. Resonant $\tau$ sneutrino production in R-parity violating supersymmetry is excluded for $\tau$ sneutrino masses below $1.7$ TeV, and couplings $\lambda_{132}=\lambda_{231}=\lambda'_{311}=0.01$. Heavy Z' gauge bosons in lepton flavour violating transitions are excluded up to $4.4$ TeV. The $\mathrm{e}\mu$ mass spectrum is also interpreted in terms of a non-resonant contribution from quantum black hole production in models with extra spatial dimensions. The exclusion limits range from $3.6$ TeV to $5.6$ TeV for number of extra dimensions between one and six.CMS CollaborationTue, 12 Dec 2017 13:35:08 GMTCMS-PAS-EXO-16-058https://cds.cern.ch/record/229709116058$CP$ violation studies in three-body charmless $B^\pm$ decays and contributions to the LHCb SciFi Trackerhttps://cds.cern.ch/record/2297080
In the first part of the thesis, we present studies on three-body charmless $B^\pm$ decays. The analysis is performed using LHCb dataset from proton-proton collisions at the centre-of-mass energy of 7 TeV and 8 TeV collected in 2011 and 2012, respectively, corresponding to an integrated luminosity of 3.1 fb$^{-1}$. We measured the inclusive $CP$ asymmetry of the four channels: $B^\pm\to K^\pm\pi^+\pi^-$, $B^\pm \to K^\pm K^+ K^-$, $B^\pm \to \pi^\pm\pi^+\pi^-$ and $B^\pm\to \pi^\pm K^+ K^-$. $CP$ asymmetries were also studied along the phase space. The second part of this thesis is devoted to my contribution to the LHCb SciFi Tracker, a detector made of scintillating fibres. It presents the experimental setups used to characterise the scintillating fibres which need to meet specific requirements to be able to operate under the running conditions foreseen for the LHCb upgrade. In addition, we discuss the results on the development of fibres made of a new class of scintillating material denominated as Nanostructured Organosilicon Luminophores (NOL). They were found to have a decay time constant at least two times shorter than the fastest scintillating fibres.Rodrigues Cavalcante, Ana BarbaraBediaga, IgnacioJoram, ChristianTue, 12 Dec 2017 11:04:13 GMTCERN-THESIS-2017-259https://cds.cern.ch/record/22970802017259Measurements of production cross-sections and mixing of charm mesons at LHCbhttps://cds.cern.ch/record/2297069
The start of the second running period of the Large Hadron Collider in 2015, delivering proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=13\ \mathrm{TeV}$, marks a new era in the study of particles containing charm quarks with samples of unprecedented size being recorded by the LHCb experiment. This thesis first presents cross-section measurements for $D^0$, $D^+$, $D_s^{+}$, and $D^{*+}$ at $\sqrt{s}=13\ \mathrm{TeV}$, supplemented by a measurement of the same cross-sections at $\sqrt{s}=5\ \mathrm{TeV}$, leading to very precise, double-differential cross-section ratios that are hugely beneficial for constraining theoretical uncertainties in quantum chromodynamics. This is followed by a study into the potential for extracting the parameters describing the oscillation of neutral $D^0$ mesons in $D^0\rightarrow K^+\pi^-\pi^+\pi^-$ decays, exploiting the very large data samples recorded at 13 TeV. These studies show that this decay can be used to heavily constrain the mixing parameters, leading to a substantial improvement of the uncertainties on them when included in the world average. However, these large datasets create computational challenges due to the sheer amount of recorded data, which is especially true for the LHCb simulation effort. Therefore, this thesis also discusses work undertaken to increase the speed at which simulated samples can be created by one order of magnitude.Muller, DominikGersabeck, MarcoParkes, ChrisTue, 12 Dec 2017 09:12:03 GMTCERN-THESIS-2017-257https://cds.cern.ch/record/22970692017257Search for third generation scalar leptoquarks decaying to a top quark and a tau lepton at sqrt(s) = 13 TeVhttps://cds.cern.ch/record/2297047
A search for pair production of heavy scalar leptoquarks (LQs) decaying into a top quark and a $\tau$ lepton is presented. The search considers final states with an electron or a muon, one or two $\tau$ leptons decaying to hadrons, and additional jets. The data collected in proton-proton collisions in 2016 at ${\sqrt{s}=13}~\mathrm{TeV}$ with the CMS detector at the LHC, corresponding to an integrated luminosity of $35.9~\mathrm{fb}^{-1}$ are used. No evidence for pair production of leptoquarks is found. Upper limits on the production cross section are set as a function of LQ mass, assuming a branching fraction of unity for the decay $\mathrm{LQ}\to \mathrm{t} \tau$, excluding masses below $900~\mathrm{GeV}$ at $95\%$ confidence level. These results provide the most stringent exclusion limits on the production of scalar leptoquarks in the top quark and $\tau$ lepton decay channel to date.CMS CollaborationTue, 12 Dec 2017 02:25:37 GMTCMS-PAS-B2G-16-028https://cds.cern.ch/record/229704716028A Measurement of the $W\gamma$ cross section at $\sqrt s = 8~$TeV in pp Collisions with the CMS Detectorhttps://cds.cern.ch/record/2297030
A measurement of cross section of the $W\gamma\rightarrow l\nu\gamma$ production in proton-proton collisions using 19.6~fb$^{-1}$ of LHC data collected by CMS detector at the center-of-mass collision energy of $\sqrt{s}=8$~TeV is reported. The $W$ bosons are identified in their electron and muon decay modes. The process of $W\gamma$ production in the Standard Model (SM) involves a pure gauge boson coupling, a $WW\gamma$ vertex, which allows one to test the electroweak sector of the SM in a unique way not achievable by studies of other processes. In addition to the total cross section, we measure the differential cross section of $W\gamma$ production as a function of a photon transverse momentum. The measurement of the differential cross section is a sensitive probe for new physics originating from an anomalous gauge coupling because possible effects of its presence increase with the photon transverse momentum and, thus, are more likely to be observed in the differential than in the total cross section. The results of this measurement agree with the Standard Model prediction at NLO in QCD, and no evidence of an anomalous triple gauge coupling has been observed. The reported total cross section measurement is the first measurement of this quantity at the~8~TeV collision energy with CMS data. The differential cross section measurement discussed in this dissertation is the first ever measurement of this process performed by CMS since the start of the LHC.Avdeeva, EkaterinaKravchenko, IlyaMon, 11 Dec 2017 17:01:22 GMTCERN-THESIS-2017-256https://cds.cern.ch/record/22970302017256BSM Higgs searches with the ATLAS detectorhttps://cds.cern.ch/record/2297008
Review of the Higgs BSM searches performed with the ATLAS detectorThe ATLAS collaborationPalacino, GabrielMon, 11 Dec 2017 15:59:47 GMT11 Dec 2017ATL-PHYS-SLIDE-2017-984https://cds.cern.ch/record/22970082017984First measurement of $\Xi_{\rm c}^0$ production in pp collisions at $\sqrt{s}=7$ TeVhttps://cds.cern.ch/record/2296996
The production of the charm-strange baryon $\Xi_{\rm c}^0$ is measured for the first time at the LHC via its semileptonic decay into $e^+ \Xi^- \nu_{\rm e}$ in pp collisions at $\sqrt{s}=7$ TeV with the ALICE detector. The transverse momentum ($p_{\rm T}$) differential cross section multiplied by the branching ratio is presented in the interval 1$&lt;$$p_{\rm T}$$&lt;$8 GeV/$c$ at mid-rapidity, $|y|&lt;0.5$. The transverse momentum dependence of the $\Xi_{\rm c}^0$ baryon production relative to the D$^0$ meson production is compared to predictions of event generators with various tunes of the hadronisation mechanism, which are found to underestimate the measured cross-section ratio.ALICE Collaboration, CERNThe ALICE collaborationMon, 11 Dec 2017 15:40:03 GMT11 Dec 2017CERN-EP-2017-332https://cds.cern.ch/record/22969962017332Search for the production of a Higgs boson in association with top quarks and decaying into a b-quark pair and b-jet identification with the ATLAS experiment at LHChttps://cds.cern.ch/record/2296985
In July 2012, the ATLAS and CMS experiments announced the discovery of a new particle, with a mass about $125$ GeV, compatible with the Standard Model Higgs boson. In order to assess if the observed particle is the one predicted by the Standard Model, the couplings if this Higgs boson to fermions have to be measured. In particular, the top quark has the strongest Yukawa coupling to the Higgs boson. The associated production of a Higgs boson with a pair of top quarks ($t\bar{t}H$) gives a direct access to this coupling. The $t\bar{t}H$ process is accessible for the first time in the Run 2 of the LHC thanks to an upgrade of the detector, especially the IBL which improves $b$-tagging, and the increase of the center of mass energy to $13$ TeV and of the integrated luminosity to $36.1$ fb$^{-1}$ in 2016. This thesis presents the search for $t\bar{t}H$ events with the Higgs boson decaying to a pair of $b$-quarks using data collected by the ATLAS detector in 2015 and 2016. The description of the background and the extraction of the $t\bar{t}H(H\rightarrow bb)$ signal in data are obtained by a statistical matching on predictions to data. In particular the $t\bar{t}+$jets background is the main limitation to signal sensitivity and is scrutinized. The identification of jets originating from $b$-quarks, called $b$-tagging, is a vital input to the search of $t\bar{t}H(H\rightarrow bb)$ events because of the four $b$-quarks in the final state. For Run 2 the definition of b-flavoured-jets in Monte Carlo simulations is revisited to improve the understanding of $b$-tagging algorithms and their performance. Standard $b$-tagging algorithms do not separate jets originating from a single $b$-quark from those originating from two $b$-quarks. Thus a specific method has been developed and is reviewed in this thesis.Calvet, Thomas PhilippeDuperrin, ArnaudAad, GeorgesMon, 11 Dec 2017 14:37:45 GMTCERN-THESIS-2017-258https://cds.cern.ch/record/22969852017258Standard Model experimental review - LHC resultshttps://cds.cern.ch/record/2296980
This presentation aims at presenting a review an status of the Standard Model based on the latest LHC results.The ATLAS collaborationOtero y Garzon, GustavoMon, 11 Dec 2017 13:37:41 GMT11 Dec 2017ATL-PHYS-SLIDE-2017-983https://cds.cern.ch/record/22969802017983ATLAS Results Highlightshttps://cds.cern.ch/record/2296905
Highlights from the ATLAS experimentThe ATLAS collaborationTovey, DanielMon, 11 Dec 2017 11:28:52 GMT11 Dec 2017ATL-PHYS-SLIDE-2017-982https://cds.cern.ch/record/22969052017982Measurement of the Higgs boson cross sections and properties in the diphoton, ZZ and WW decay channels using the ATLAS detectorhttps://cds.cern.ch/record/2296902
The latest results on the measurement of the Higgs boson cross sections and properties in the diphoton, ZZ and WW decay channels with the ATLAS detector are presented, using about 36 fb-1 of pp collision data collected at 13 TeV.The ATLAS collaborationSessa, MarcoMon, 11 Dec 2017 10:49:57 GMT11 Dec 2017ATL-PHYS-SLIDE-2017-981https://cds.cern.ch/record/22969022017981Neodymium-140 DOTA-LM3: Evaluation of an In Vivo Generator for PET with a Non-Internalizing Vectorhttps://cds.cern.ch/record/2296883
Severin, Gregory W.Kristensen, Lotte K.Nielsen, Carsten H.Fonslet, JesperJensen, Andreas I.Frellsen, Anders F.Jensen, K. M.Elema, Dennis R.Maecke, HelmutKjær, AndreasJohnston, KarlKöster, UlliMon, 11 Dec 2017 09:48:35 GMThttps://cds.cern.ch/record/2296883['']New Technique for Luminosity Measurement Using 3D Pixel Modules in the ATLAS IBL Detectorhttps://cds.cern.ch/record/2296869
The Insertable b-Layer ( IBL ) is the innermost layer of the ATLAS tracking system. It consists of planar pixel modules in the central region and 3D modules at two extremities. We use the cluster length distributions in 3D sensor modules of the IBL to determine the number of primary charged particles per event and suppress backgrounds. This Pixel Cluster Counting ( PCC ) algorithm provides a bunch-by-bunch luminosity measurement. An accurate luminosity measurement is a key component for precision measurements at the Large Hadron Collider and one of the largest uncertainties on the luminosity determination in ATLAS arises from the long-term stability of the measurement technique. The comparison of the PCC algorithm with other existing algorithms provides key insights in assessing and reducing such uncertainty.The ATLAS collaborationLiu, PeilianSun, 10 Dec 2017 14:22:45 GMT10 Dec 2017ATL-INDET-SLIDE-2017-980https://cds.cern.ch/record/22968692017980Top pair and single top production in ATLAShttps://cds.cern.ch/record/2296832
Measurements of inclusive and differential top-quark production cross sections in proton-proton collisions at a center of mass energy of 8 TeV and 13 TeV at the Large Hadron Collider using the ATLAS detector are presented. The inclusive measurements of top quark pair and single top quark production are compared to the best available theoretical calculations. Differential measurements of the kinematic properties of top quark events are also discussed. These measurements, including results using boosted top quarks, probe our understanding of top quark production up to the TeV scale.The ATLAS collaborationFabbri, FedericaSat, 09 Dec 2017 22:37:44 GMT09 Dec 2017ATL-PHYS-PROC-2017-268https://cds.cern.ch/record/22968322017268Hunting New Physics with ATLAShttps://cds.cern.ch/record/2296825
Highlights from recent new physics searches with the ATLAS detector at the CERN LHC are presented in this paper. They include searches for extra-dimension models, compositeness, new gauge bosons, supersymmetry, among others. Results are based on analyses of pp collision data recorded at a centre-of-mass energy of 13 TeV.The ATLAS collaborationMitsou, Vasiliki A.Sat, 09 Dec 2017 15:00:02 GMT09 Dec 2017ATL-PHYS-PROC-2017-267https://cds.cern.ch/record/22968252017267